Downloading Windows 7

I am currently trying to download windows 7 to play some PC games with some friends and i have a copy of windows 7 and intent on downloading it.

However i have a few questions for those who can help. I understand that i need a USB drive for the apple support software.. Can i just use a regular usb stick for this part.

I have seen videos of people install this but i keep wondering what the USB is for nobody seems to mention it and i still don't understand what i would need to do.

I have mountain lion 10.8.3 and am pretty much solid on the directions except for the USB part of the instal. Basically do i plug it in and than take it out after everything is on it or do i leave it in the whole time not to sure what to do?

How do you know he is pirating it? He just says downloading. Not torrenting MS has Windows 7 that you can download if you purchased it in the past and in some cases (like via Dreamspark) offers it for free.

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